---
product_id: 247311680
title: "SBM-20 Geiger-Muller Tube"
brand: "mightyohm"
price: "R$860"
currency: BRL
in_stock: true
reviews_count: 8
category: "Mighty Ohm"
url: https://www.desertcart.com.br/products/247311680-sbm-20-geiger-muller-tube
store_origin: BR
region: Brazil
---

# Precision-tested for reliability Sensitive to beta & gamma radiation DIY-friendly, easy integration SBM-20 Geiger-Muller Tube

**Brand:** mightyohm
**Price:** R$860
**Availability:** ✅ In Stock

## Summary

> ☢️ Detect the unseen, join the radiation revolution!

## Quick Answers

- **What is this?** SBM-20 Geiger-Muller Tube by mightyohm
- **How much does it cost?** R$860 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/247311680-sbm-20-geiger-muller-tube)

## Best For

- mightyohm enthusiasts

## Why This Product

- Trusted mightyohm brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact & Lightweight:** At just 0.634 ounces and under 5 inches, it fits perfectly into any portable radiation detection setup.
- • **Lab-Grade Reliability:** Each SBM-20 tube undergoes rigorous testing to ensure consistent, accurate readings every time.
- • **Trusted by Innovators:** A top choice among hobbyists and professionals alike, ranked #39 in Lab Geiger Counters.
- • **Seamless DIY Integration:** Designed for easy installation in custom Geiger counters, empowering your scientific creativity.
- • **Radiation Sensitivity Mastery:** Detects both beta and gamma rays with high precision for advanced DIY projects.

## Overview

The SBM-20 Geiger-Muller Tube is a precision-tested, glass-encased sensor highly sensitive to beta and gamma radiation. Popular in DIY and professional Geiger counters, it offers reliable detection in a compact, lightweight form factor, making it a must-have for scientific enthusiasts and radiation monitoring experts.

## Description

This is the iconic SBM-20 Geiger-Muller Tube used in many DIY Geiger Counter projects. This tube is sensitive to beta and gamma radiation. Each tube is tested and carefully packaged.

Review: Great Muon detector - Detects Muons just fine. It's a lot of fun to play with, and I highly recommend it.
Review: Installed into my GMC-300S Geiger Counter - Product arrived in protective tube that works well. I opened my GMC and cut the 2 zip-ties. I then removed the glass Chinese Geiger tube that comes with it. A J something tube. I then had to pull the two Geiger tube retainer clips off with pliers and a soldering iron gently. Move both to their farthest apart positions. Press the clips into the holes gently while heating the rear of the board gently. Flux brushed onto the new holes may help adhesion prior to resoldering the retainers into their new farther apart positions. Make sure tube is installed the correct polarity. Both tube and board are marked so there’s no confusion. Close that back up and enjoy your increased sensitivity.

## Features

- This popular tube is used in many DIY Geiger Counter projects.
- Sensitive to beta and gamma radiation.
- Each tube is tested and carefully packaged.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08MJ2Z3H3 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #239,478 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #39 in Lab Geiger Counters |
| Brand | MightyOhm |
| Color | Gold |
| Customer Reviews | 4.8 4.8 out of 5 stars (28) |
| Date First Available | November 2, 2020 |
| Item Package Quantity | 1 |
| Item Weight | 0.634 ounces |
| Item model number | 1011 |
| Manufacturer | MightyOhm LLC |
| Material | Glass |
| Package Dimensions | 4.9 x 0.79 x 0.79 inches |
| Part Number | 1011 |
| Specific Uses For Product | Radiation detection in scientific, industrial, or DIY settings |
| UPC | 860005573226 |

## Product Details

- **Brand:** MightyOhm
- **Color:** Gold
- **Item Weight:** 0.02 Kilograms
- **Manufacturer:** MightyOhm LLC
- **Material:** Glass
- **Specific Uses For Product:** Radiation detection in scientific, industrial, or DIY settings
- **UPC:** 860005573226

## Images

![SBM-20 Geiger-Muller Tube - Image 1](https://m.media-amazon.com/images/I/61RV+w-BMgL.jpg)

## Questions & Answers

**Q: Does the data sheet come in English?**
A: Hahahaha....no.  It doesn't come with a data sheet at all.  That being said, a little research into the nature of the device(s) will yield suitable guesstimates.  These are low current, fairly low (280 - 350) volt tubes and they're SLOW, so don't expect to get good science out of them.  Wikipedia has a little bit of data on them, and a few trial runs with cheap isolation type electronics can give you some solid state circuitry, but they're really designed for the vacuum tube era and mate perfectly with old triodes.  Don't try juicing it up, look at the operating curve for the reason why.  Good luck to you, they're interesting tech toys.  You DO need a really clean DC supply and adequate shielding for the counter, otherwise you'll be swamped with noise.

**Q: If the tube is sensitive to gamma radiation, will it also work for X-rays as well?**
A: Yes, the tube will detect x-rays, however there are no specifications for x-ray sensitivity so performance is not guaranteed. I will say that other customers are using it to detect x-rays and have been satisfied by the performance.

**Q: How do you properly pack/store this device in your luggage? Will anything happen to it if it passes through an X-ray machine?**
A: This should not be a problem. The biggest risk is shock or crush damage. Make sure to protect the tube from being accidentally dented or crushed, as the tubes are very fragile! I recommend a sturdy box or plastic enclosure to protect the tube, and sufficient bubble wrap to keep the tube from rattling around inside the box.
As an aside, these tubes can be used to detect x-rays, but I do not recommend attempting to this in an airport security line.
You can see the kit being used to detect x-rays in several Applied Science videos, including this one:
https://www.youtube.com/watch?v=H7ldYhzKAp4&ab_channel=AppliedScience

**Q: Is this device tsa approved? i am planning on traveling to ecuador but i am concerned if the tsa will not allow me to take this on a plane.**
A: I'm not aware of a TSA regulation that specifically pertains to Geiger counter tubes. 
However, Geiger Counters are specifically allowed: 
https://www.tsa.gov/travel/security-screening/whatcanibring/items/geiger-counters

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Muon detector
*by T***M on October 29, 2025*

Detects Muons just fine. It's a lot of fun to play with, and I highly recommend it.

### ⭐⭐⭐⭐⭐ Installed into my GMC-300S Geiger Counter
*by D***X on April 22, 2024*

Product arrived in protective tube that works well. I opened my GMC and cut the 2 zip-ties. I then removed the glass Chinese Geiger tube that comes with it. A J something tube. I then had to pull the two Geiger tube retainer clips off with pliers and a soldering iron gently. Move both to their farthest apart positions. Press the clips into the holes gently while heating the rear of the board gently. Flux brushed onto the new holes may help adhesion prior to resoldering the retainers into their new farther apart positions. Make sure tube is installed the correct polarity. Both tube and board are marked so there’s no confusion. Close that back up and enjoy your increased sensitivity.

### ⭐⭐⭐⭐⭐ Muon Counter
*by M***T on July 7, 2023*

I got 2 of these with two of the geiger boards. Plugged these in. Ran the output wire from each unit to a little $7 microchip that was a logic chip. It was a "AND" chip. Only if both tubes send a signal at the same time does the "AND" chip turn on. Stack the tubes, separated by sheets of lead. Only a cosmic-ray induced MUON can penetrate two sheets of lead and two geiger tubes a the "same" time. See my other reviews for a more thorough explanation.

## Frequently Bought Together

- MightyOhm SBM-20 Geiger-Muller Tube
- MightyOhm Geiger Counter Kit Bundle
- Shkalacar Assembled DIY Geiger Counter Kit, DIY Nuclear Radiation Detector Kit with Miller Tube, Portable Geiger Counter, Assembled Radiation Detector System Experimental Module

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-02-02*